118 Journal New York Entomological Society. [Vol. xx. 



The uterus, whose form is unknown, contained about forty maggots. 

 The first-stage maggot is moderately slender, gently tapered at each 

 end, white, with narrow bands of faint spines at the junctures of the 

 segments, the first two anterior bands, especially the first, being usually 

 the broadest and most distinct. The cephalopharyngeal skeleton lacks 

 the dorsopharyngeal sclerite ; the pharyngeal sclerite is normally 

 developed in its upper wing, but the lower wing is atrophied and its 

 place is taken by the infrapharyngeal sclerite. The hypostomal and 

 infrahypostomal sclerites are distinct and both paired. The mandib- 

 ular sclerite is paired and consists of a small but swollen base, pass- 

 ing into a slender and short median arm, and terminated apically by 

 an elongate-subovate leaf-like or spatulate enlargement, while the 

 dentate sclerite is elongate with a tooth at its apical angle. The 

 skeleton is furcate clear to the mandibular leaves, which are more 

 approximated to each other than are the two sclerites forming any of 

 the other pairs. The labial sclerites are only faintly distinguishable. 

 There is no sign of the T-ribs of the pharyngeal floor described and 

 figured by Hewitt. What is more, I have never been able to find any 

 trace of these T-ribs in any first-stage muscoid maggot, and am con- 

 strained to believe that they do not occur in this stage. Hewitt's 

 figure of them (PI. 31, Fig. 18) is from the third stage of Miisca. 

 The anal stigmatal cavity that characterizes most sacrophagid maggots 

 in all stages does not show. The anal stigmatic tubes are borne ven- 

 trally near base of thirteenth segment in a pair of short processes 

 surmounted by two slightly chitinous pointed spines. The maggot 

 and cephalopharyngeal skeleton are shown in Figs. 247 and 248 of 

 Contr. Th. Knowl. Muse. Flies. 



Type, TD354 (fly and slide of maggots). 



This is type not only of the genus but of the tribe Protodcxiini. 



In explanation of my later but still tentative interpretation of the 

 segmental homologies in the muscoid maggot, I should state that the 

 dentate is apparently not an ordinate or main sclerite as published by 

 me in Ann. E. S. Am., Vol. IV, pp. 150-1. Leaving out the dentate, 

 which is evidently a development from the mandibular sclerite, the 

 other six form the ordinate sclerites as distinguished from the minor 

 or subordinate sclerites. The six ordinate sclerites plus the pseudo- 

 cephalon (segment I) and its paired labial sclerite would represent 

 the seven primitive head-segments, or segments I to VII of ancestral 



